Home / 3,122.78-4,311.16-2,129.51

Finding the Fourth Proportional to 3,122.78, 4,311.16 and 2,129.51

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Solution

The fourth proportional to 3,122.78, 4,311.16 and 2,129.51 is: 2,939.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,122.78 : 4,311.16 = 2,129.51 : x
  2. Step 2: Convert to fraction form
    3,122.78/4,311.16 = 2,129.51/x
  3. Step 3: Cross multiply
    3,122.78x = 4,311.16 × 2,129.51
  4. Step 4: Simplify right side
    3,122.78x = 9,180,658.33
  5. Step 5: Solve for x
    x = 9,180,658.33/3,122.78
  6. Step 6: Final answer
    x = 2,939.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.